In theory the motorist then slows down, and a speed bump is no longer needed.
I think I'm going to have to suggest that this is a bad idea. While I'm no psychologist, there surely has to be a 'cry wolf' effect here. If I'm driving around and constantly see images of children appearing in the road, after a time, I'm probably going to be less responsive if a real child happens to be in the road.
"Oh it's just one of those new 3D children optical illusion speed bumps that I blogged about," I'll think. Then splat, and I'm cleaning bits of child off my front bumper for the next couple of weeks, and explaining to the judge why I didn't even try to stop.
Seems like this idea might have some flaws.
